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    <h1 class="post_title">U-Boot从dtb获取内存布局并传递到内核</h1>
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      2020/03/10</span>
    <span class="post_time"> | 4 分钟阅读</span><span>&nbsp;|<a href='https://kingdix10.gitee.io/tags/%E5%90%AF%E5%8A%A8%E6%B5%81%E7%A8%8B/' title="启动流程" class="post_tag button button_translucent">启动流程
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        </a><a href='https://kingdix10.gitee.io/tags/%E5%86%85%E5%AD%98%E7%AE%A1%E7%90%86/' title="内存管理" class="post_tag button button_translucent">内存管理
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      <div class="post_toc">
        <h2>文章目录</h2>
        <nav id="TableOfContents">
  <ul>
    <li><a href="#1-u-boot获取布局内存">1. U-Boot获取布局内存</a>
      <ul>
        <li><a href="#11-fdtdec_setup_memory_banksize从dtb获取内存布局">1.1. fdtdec_setup_memory_banksize：从dtb获取内存布局</a></li>
        <li><a href="#12-arch_fixup_fdt转换gd-bd-bi_dram">1.2. arch_fixup_fdt：转换gd-&gt;bd-&gt;bi_dram</a></li>
        <li><a href="#13-fdt_fixup_memory_banks修改内核dtb">1.3. fdt_fixup_memory_banks：修改内核dtb</a></li>
      </ul>
    </li>
    <li><a href="#2-函数源码">2. 函数源码</a>
      <ul>
        <li><a href="#21-dram_init_banksize">2.1. dram_init_banksize</a></li>
        <li><a href="#22-fdtdec_setup_memory_banksize">2.2. fdtdec_setup_memory_banksize</a></li>
        <li><a href="#23-arch_fixup_fdt">2.3. arch_fixup_fdt</a></li>
        <li><a href="#24-fdt_fixup_memory_banks">2.4. fdt_fixup_memory_banks</a></li>
      </ul>
    </li>
  </ul>
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      </div>
    
    <div class="post_body"><h1 id="1-u-boot获取布局内存">1. U-Boot获取布局内存</h1>
<p>在DDR控制器初始化完成之后，就要确定系统中有多少可用内存，这通常是由dram_init_banksize来实现的，而不同的板级文件会实现不同的dram_init_banksize，这也就决定了不同的板级可以定义不同的获取内存布局的方法。这里介绍一种从dtb中获取内存布局的实现，这可以通过简单的调用fdtdec_setup_memory_banksize来实现。而在使能了CONFIG_OF_LIBFDT的情况下，U-Boot又会通过fdt_fixup_memory_banks来为内核dtb添加或修改memory节点，这样就可以只在U-Boot中定义memory信息，内核dtb省略memory定义，从而可以使其更加简洁通用。相信这也是后续U-Boot推荐使用的方式。</p>
<p>这里涉及的函数逻辑都比较简单，下面简单介绍一下。</p>
<h2 id="11-fdtdec_setup_memory_banksize从dtb获取内存布局">1.1. fdtdec_setup_memory_banksize：从dtb获取内存布局</h2>
<p>fdtdec_setup_memory_banksize的逻辑很简单，就是从dtb中解析memory节点，然后将内存的start和size填充到gd-&gt;bd-&gt;bi_dram数组。</p>
<h2 id="12-arch_fixup_fdt转换gd-bd-bi_dram">1.2. arch_fixup_fdt：转换gd-&gt;bd-&gt;bi_dram</h2>
<p>arch_fixup_fdt是一个处理器或板级相关的函数，默认实现为一个空的weak函数。这里以ARM的实现举例。</p>
<p>bi_dram本质是一个结构体数组，而fdt_fixup_memory_banks的参数是start数组和size数组，arch_fixup_fdt完成一个简单的转换。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-c" data-lang="c"><span class="line"><span class="ln">1</span><span class="cl">	<span class="k">struct</span> <span class="p">{</span>			<span class="cm">/* RAM configuration */</span>
</span></span><span class="line"><span class="ln">2</span><span class="cl">		<span class="kt">phys_addr_t</span> <span class="n">start</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">3</span><span class="cl">		<span class="kt">phys_size_t</span> <span class="n">size</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">4</span><span class="cl">	<span class="p">}</span> <span class="n">bi_dram</span><span class="p">[</span><span class="n">CONFIG_NR_DRAM_BANKS</span><span class="p">];</span>
</span></span></code></pre></div><h2 id="13-fdt_fixup_memory_banks修改内核dtb">1.3. fdt_fixup_memory_banks：修改内核dtb</h2>
<p>fdt_fixup_memory_banks的主要逻辑如下：</p>
<ol>
<li>找到内核dtb的memory节点，如果没有则创建一个memory节点</li>
<li>设置节点的属性为device_type</li>
<li>将所有的memory的start和size信息写到内核dtb</li>
</ol>
<p>这里需要注意的是，如果内核dtb中已有memory节点，fdt_fixup_memory_banks只修改第一个memory节点。</p>
<h1 id="2-函数源码">2. 函数源码</h1>
<p>U-Boot版本：v2023.04</p>
<h2 id="21-dram_init_banksize">2.1. dram_init_banksize</h2>
<p>如下只是dram_init_banksize的一个示例，不同的板级会不同的实现。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-c" data-lang="c"><span class="line"><span class="ln">1</span><span class="cl"><span class="kt">int</span> <span class="nf">dram_init_banksize</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">2</span><span class="cl"><span class="p">{</span>
</span></span><span class="line"><span class="ln">3</span><span class="cl">	<span class="k">return</span> <span class="nf">fdtdec_setup_memory_banksize</span><span class="p">();</span>
</span></span><span class="line"><span class="ln">4</span><span class="cl"><span class="p">}</span>
</span></span></code></pre></div><h2 id="22-fdtdec_setup_memory_banksize">2.2. fdtdec_setup_memory_banksize</h2>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-c" data-lang="c"><span class="line"><span class="ln"> 1</span><span class="cl"><span class="cm">/**
</span></span></span><span class="line"><span class="ln"> 2</span><span class="cl"><span class="cm"> * fdtdec_setup_memory_banksize() - decode and populate gd-&gt;bd-&gt;bi_dram
</span></span></span><span class="line"><span class="ln"> 3</span><span class="cl"><span class="cm"> *
</span></span></span><span class="line"><span class="ln"> 4</span><span class="cl"><span class="cm"> * Decode the /memory &#39;reg&#39; property to determine the address and size of the
</span></span></span><span class="line"><span class="ln"> 5</span><span class="cl"><span class="cm"> * memory banks. Use this data to populate the global data board info with the
</span></span></span><span class="line"><span class="ln"> 6</span><span class="cl"><span class="cm"> * phys address and size of memory banks.
</span></span></span><span class="line"><span class="ln"> 7</span><span class="cl"><span class="cm"> *
</span></span></span><span class="line"><span class="ln"> 8</span><span class="cl"><span class="cm"> * This function should be called from a boards dram_init_banksize(). This
</span></span></span><span class="line"><span class="ln"> 9</span><span class="cl"><span class="cm"> * helper function allows for boards to query the device tree for memory bank
</span></span></span><span class="line"><span class="ln">10</span><span class="cl"><span class="cm"> * information instead of hard coding the information in cases where it cannot
</span></span></span><span class="line"><span class="ln">11</span><span class="cl"><span class="cm"> * be detected automatically.
</span></span></span><span class="line"><span class="ln">12</span><span class="cl"><span class="cm"> *
</span></span></span><span class="line"><span class="ln">13</span><span class="cl"><span class="cm"> * Return: 0 if OK, -EINVAL if the /memory node or reg property is missing or
</span></span></span><span class="line"><span class="ln">14</span><span class="cl"><span class="cm"> * invalid
</span></span></span><span class="line"><span class="ln">15</span><span class="cl"><span class="cm"> */</span>
</span></span><span class="line"><span class="ln">16</span><span class="cl">
</span></span><span class="line"><span class="ln">17</span><span class="cl"><span class="kt">int</span> <span class="nf">fdtdec_setup_memory_banksize</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">18</span><span class="cl"><span class="p">{</span>
</span></span><span class="line"><span class="ln">19</span><span class="cl">	<span class="kt">int</span> <span class="n">bank</span><span class="p">,</span> <span class="n">ret</span><span class="p">,</span> <span class="n">reg</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">20</span><span class="cl">	<span class="k">struct</span> <span class="n">resource</span> <span class="n">res</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">21</span><span class="cl">	<span class="n">ofnode</span> <span class="n">mem</span> <span class="o">=</span> <span class="nf">ofnode_null</span><span class="p">();</span>
</span></span><span class="line"><span class="ln">22</span><span class="cl">
</span></span><span class="line"><span class="ln">23</span><span class="cl">	<span class="n">mem</span> <span class="o">=</span> <span class="nf">get_next_memory_node</span><span class="p">(</span><span class="n">mem</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">24</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nf">ofnode_valid</span><span class="p">(</span><span class="n">mem</span><span class="p">))</span> <span class="p">{</span>
</span></span><span class="line"><span class="ln">25</span><span class="cl">		<span class="nf">debug</span><span class="p">(</span><span class="s">&#34;%s: Missing /memory node</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span> <span class="n">__func__</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">26</span><span class="cl">		<span class="k">return</span> <span class="o">-</span><span class="n">EINVAL</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">27</span><span class="cl">	<span class="p">}</span>
</span></span><span class="line"><span class="ln">28</span><span class="cl">
</span></span><span class="line"><span class="ln">29</span><span class="cl">	<span class="k">for</span> <span class="p">(</span><span class="n">bank</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">bank</span> <span class="o">&lt;</span> <span class="n">CONFIG_NR_DRAM_BANKS</span><span class="p">;</span> <span class="n">bank</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="ln">30</span><span class="cl">		<span class="n">ret</span> <span class="o">=</span> <span class="nf">ofnode_read_resource</span><span class="p">(</span><span class="n">mem</span><span class="p">,</span> <span class="n">reg</span><span class="o">++</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">31</span><span class="cl">		<span class="k">if</span> <span class="p">(</span><span class="n">ret</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="ln">32</span><span class="cl">			<span class="n">reg</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">33</span><span class="cl">			<span class="n">mem</span> <span class="o">=</span> <span class="nf">get_next_memory_node</span><span class="p">(</span><span class="n">mem</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">34</span><span class="cl">			<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nf">ofnode_valid</span><span class="p">(</span><span class="n">mem</span><span class="p">))</span>
</span></span><span class="line"><span class="ln">35</span><span class="cl">				<span class="k">break</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">36</span><span class="cl">
</span></span><span class="line"><span class="ln">37</span><span class="cl">			<span class="n">ret</span> <span class="o">=</span> <span class="nf">ofnode_read_resource</span><span class="p">(</span><span class="n">mem</span><span class="p">,</span> <span class="n">reg</span><span class="o">++</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">38</span><span class="cl">			<span class="k">if</span> <span class="p">(</span><span class="n">ret</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">39</span><span class="cl">				<span class="k">break</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">40</span><span class="cl">		<span class="p">}</span>
</span></span><span class="line"><span class="ln">41</span><span class="cl">
</span></span><span class="line"><span class="ln">42</span><span class="cl">		<span class="k">if</span> <span class="p">(</span><span class="n">ret</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">43</span><span class="cl">			<span class="k">return</span> <span class="o">-</span><span class="n">EINVAL</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">44</span><span class="cl">
</span></span><span class="line"><span class="ln">45</span><span class="cl">		<span class="n">gd</span><span class="o">-&gt;</span><span class="n">bd</span><span class="o">-&gt;</span><span class="n">bi_dram</span><span class="p">[</span><span class="n">bank</span><span class="p">].</span><span class="n">start</span> <span class="o">=</span> <span class="p">(</span><span class="kt">phys_addr_t</span><span class="p">)</span><span class="n">res</span><span class="p">.</span><span class="n">start</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">46</span><span class="cl">		<span class="n">gd</span><span class="o">-&gt;</span><span class="n">bd</span><span class="o">-&gt;</span><span class="n">bi_dram</span><span class="p">[</span><span class="n">bank</span><span class="p">].</span><span class="n">size</span> <span class="o">=</span>
</span></span><span class="line"><span class="ln">47</span><span class="cl">			<span class="p">(</span><span class="kt">phys_size_t</span><span class="p">)(</span><span class="n">res</span><span class="p">.</span><span class="n">end</span> <span class="o">-</span> <span class="n">res</span><span class="p">.</span><span class="n">start</span> <span class="o">+</span> <span class="mi">1</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">48</span><span class="cl">
</span></span><span class="line"><span class="ln">49</span><span class="cl">		<span class="nf">debug</span><span class="p">(</span><span class="s">&#34;%s: DRAM Bank #%d: start = 0x%llx, size = 0x%llx</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span>
</span></span><span class="line"><span class="ln">50</span><span class="cl">		      <span class="n">__func__</span><span class="p">,</span> <span class="n">bank</span><span class="p">,</span>
</span></span><span class="line"><span class="ln">51</span><span class="cl">		      <span class="p">(</span><span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">long</span><span class="p">)</span><span class="n">gd</span><span class="o">-&gt;</span><span class="n">bd</span><span class="o">-&gt;</span><span class="n">bi_dram</span><span class="p">[</span><span class="n">bank</span><span class="p">].</span><span class="n">start</span><span class="p">,</span>
</span></span><span class="line"><span class="ln">52</span><span class="cl">		      <span class="p">(</span><span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">long</span><span class="p">)</span><span class="n">gd</span><span class="o">-&gt;</span><span class="n">bd</span><span class="o">-&gt;</span><span class="n">bi_dram</span><span class="p">[</span><span class="n">bank</span><span class="p">].</span><span class="n">size</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">53</span><span class="cl">	<span class="p">}</span>
</span></span><span class="line"><span class="ln">54</span><span class="cl">
</span></span><span class="line"><span class="ln">55</span><span class="cl">	<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">56</span><span class="cl"><span class="p">}</span>
</span></span></code></pre></div><h2 id="23-arch_fixup_fdt">2.3. arch_fixup_fdt</h2>
<p>源码文件：arch/arm/lib/bootm-fdt.c</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-c" data-lang="c"><span class="line"><span class="ln"> 1</span><span class="cl"><span class="kt">int</span> <span class="nf">arch_fixup_fdt</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">blob</span><span class="p">)</span>
</span></span><span class="line"><span class="ln"> 2</span><span class="cl"><span class="p">{</span>
</span></span><span class="line"><span class="ln"> 3</span><span class="cl">	<span class="n">__maybe_unused</span> <span class="kt">int</span> <span class="n">ret</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
</span></span><span class="line"><span class="ln"> 4</span><span class="cl"><span class="cp">#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_OF_LIBFDT)
</span></span></span><span class="line"><span class="ln"> 5</span><span class="cl"><span class="cp"></span>	<span class="k">struct</span> <span class="n">bd_info</span> <span class="o">*</span><span class="n">bd</span> <span class="o">=</span> <span class="n">gd</span><span class="o">-&gt;</span><span class="n">bd</span><span class="p">;</span>
</span></span><span class="line"><span class="ln"> 6</span><span class="cl">	<span class="kt">int</span> <span class="n">bank</span><span class="p">;</span>
</span></span><span class="line"><span class="ln"> 7</span><span class="cl">	<span class="n">u64</span> <span class="n">start</span><span class="p">[</span><span class="n">CONFIG_NR_DRAM_BANKS</span><span class="p">];</span>
</span></span><span class="line"><span class="ln"> 8</span><span class="cl">	<span class="n">u64</span> <span class="n">size</span><span class="p">[</span><span class="n">CONFIG_NR_DRAM_BANKS</span><span class="p">];</span>
</span></span><span class="line"><span class="ln"> 9</span><span class="cl">
</span></span><span class="line"><span class="ln">10</span><span class="cl">	<span class="k">for</span> <span class="p">(</span><span class="n">bank</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">bank</span> <span class="o">&lt;</span> <span class="n">CONFIG_NR_DRAM_BANKS</span><span class="p">;</span> <span class="n">bank</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="ln">11</span><span class="cl">		<span class="n">start</span><span class="p">[</span><span class="n">bank</span><span class="p">]</span> <span class="o">=</span> <span class="n">bd</span><span class="o">-&gt;</span><span class="n">bi_dram</span><span class="p">[</span><span class="n">bank</span><span class="p">].</span><span class="n">start</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">12</span><span class="cl">		<span class="n">size</span><span class="p">[</span><span class="n">bank</span><span class="p">]</span> <span class="o">=</span> <span class="n">bd</span><span class="o">-&gt;</span><span class="n">bi_dram</span><span class="p">[</span><span class="n">bank</span><span class="p">].</span><span class="n">size</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">13</span><span class="cl"><span class="cp">#ifdef CONFIG_ARMV7_NONSEC
</span></span></span><span class="line"><span class="ln">14</span><span class="cl"><span class="cp"></span>		<span class="n">ret</span> <span class="o">=</span> <span class="nf">armv7_apply_memory_carveout</span><span class="p">(</span><span class="o">&amp;</span><span class="n">start</span><span class="p">[</span><span class="n">bank</span><span class="p">],</span> <span class="o">&amp;</span><span class="n">size</span><span class="p">[</span><span class="n">bank</span><span class="p">]);</span>
</span></span><span class="line"><span class="ln">15</span><span class="cl">		<span class="k">if</span> <span class="p">(</span><span class="n">ret</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">16</span><span class="cl">			<span class="k">return</span> <span class="n">ret</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">17</span><span class="cl"><span class="cp">#endif
</span></span></span><span class="line"><span class="ln">18</span><span class="cl"><span class="cp"></span>	<span class="p">}</span>
</span></span><span class="line"><span class="ln">19</span><span class="cl">
</span></span><span class="line"><span class="ln">20</span><span class="cl"><span class="cp">#ifdef CONFIG_OF_LIBFDT
</span></span></span><span class="line"><span class="ln">21</span><span class="cl"><span class="cp"></span>	<span class="n">ret</span> <span class="o">=</span> <span class="nf">fdt_fixup_memory_banks</span><span class="p">(</span><span class="n">blob</span><span class="p">,</span> <span class="n">start</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">CONFIG_NR_DRAM_BANKS</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">22</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="n">ret</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">23</span><span class="cl">		<span class="k">return</span> <span class="n">ret</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">24</span><span class="cl"><span class="cp">#endif
</span></span></span><span class="line"><span class="ln">25</span><span class="cl"><span class="cp"></span>
</span></span><span class="line"><span class="ln">26</span><span class="cl"><span class="cp">#ifdef CONFIG_ARMV8_SPIN_TABLE
</span></span></span><span class="line"><span class="ln">27</span><span class="cl"><span class="cp"></span>	<span class="n">ret</span> <span class="o">=</span> <span class="nf">spin_table_update_dt</span><span class="p">(</span><span class="n">blob</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">28</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="n">ret</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">29</span><span class="cl">		<span class="k">return</span> <span class="n">ret</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">30</span><span class="cl"><span class="cp">#endif
</span></span></span><span class="line"><span class="ln">31</span><span class="cl"><span class="cp"></span>
</span></span><span class="line"><span class="ln">32</span><span class="cl"><span class="cp">#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV8_PSCI) || \
</span></span></span><span class="line"><span class="ln">33</span><span class="cl"><span class="cp">	CONFIG_IS_ENABLED(SEC_FIRMWARE_ARMV8_PSCI)
</span></span></span><span class="line"><span class="ln">34</span><span class="cl"><span class="cp"></span>	<span class="n">ret</span> <span class="o">=</span> <span class="nf">psci_update_dt</span><span class="p">(</span><span class="n">blob</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">35</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="n">ret</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">36</span><span class="cl">		<span class="k">return</span> <span class="n">ret</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">37</span><span class="cl"><span class="cp">#endif
</span></span></span><span class="line"><span class="ln">38</span><span class="cl"><span class="cp">#endif
</span></span></span><span class="line"><span class="ln">39</span><span class="cl"><span class="cp"></span>
</span></span><span class="line"><span class="ln">40</span><span class="cl"><span class="cp">#ifdef CONFIG_FMAN_ENET
</span></span></span><span class="line"><span class="ln">41</span><span class="cl"><span class="cp"></span>	<span class="n">ret</span> <span class="o">=</span> <span class="nf">fdt_update_ethernet_dt</span><span class="p">(</span><span class="n">blob</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">42</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="n">ret</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">43</span><span class="cl">		<span class="k">return</span> <span class="n">ret</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">44</span><span class="cl"><span class="cp">#endif
</span></span></span><span class="line"><span class="ln">45</span><span class="cl"><span class="cp"></span>	<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">46</span><span class="cl"><span class="p">}</span>
</span></span></code></pre></div><h2 id="24-fdt_fixup_memory_banks">2.4. fdt_fixup_memory_banks</h2>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-c" data-lang="c"><span class="line"><span class="ln"> 1</span><span class="cl"><span class="cm">/**
</span></span></span><span class="line"><span class="ln"> 2</span><span class="cl"><span class="cm"> * fdt_fixup_memory_banks - Update DT memory node
</span></span></span><span class="line"><span class="ln"> 3</span><span class="cl"><span class="cm"> * @blob: Pointer to DT blob
</span></span></span><span class="line"><span class="ln"> 4</span><span class="cl"><span class="cm"> * @start: Pointer to memory start addresses array
</span></span></span><span class="line"><span class="ln"> 5</span><span class="cl"><span class="cm"> * @size: Pointer to memory sizes array
</span></span></span><span class="line"><span class="ln"> 6</span><span class="cl"><span class="cm"> * @banks: Number of memory banks
</span></span></span><span class="line"><span class="ln"> 7</span><span class="cl"><span class="cm"> *
</span></span></span><span class="line"><span class="ln"> 8</span><span class="cl"><span class="cm"> * Return: 0 on success, negative value on failure
</span></span></span><span class="line"><span class="ln"> 9</span><span class="cl"><span class="cm"> *
</span></span></span><span class="line"><span class="ln">10</span><span class="cl"><span class="cm"> * Based on the passed number of banks and arrays, the function is able to
</span></span></span><span class="line"><span class="ln">11</span><span class="cl"><span class="cm"> * update existing DT memory nodes to match run time detected/changed memory
</span></span></span><span class="line"><span class="ln">12</span><span class="cl"><span class="cm"> * configuration. Implementation is handling one specific case with only one
</span></span></span><span class="line"><span class="ln">13</span><span class="cl"><span class="cm"> * memory node where multiple tuples could be added/updated.
</span></span></span><span class="line"><span class="ln">14</span><span class="cl"><span class="cm"> * The case where multiple memory nodes with a single tuple (base, size) are
</span></span></span><span class="line"><span class="ln">15</span><span class="cl"><span class="cm"> * used, this function is only updating the first memory node without removing
</span></span></span><span class="line"><span class="ln">16</span><span class="cl"><span class="cm"> * others.
</span></span></span><span class="line"><span class="ln">17</span><span class="cl"><span class="cm"> */</span>
</span></span><span class="line"><span class="ln">18</span><span class="cl"><span class="kt">int</span> <span class="nf">fdt_fixup_memory_banks</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">blob</span><span class="p">,</span> <span class="n">u64</span> <span class="n">start</span><span class="p">[],</span> <span class="n">u64</span> <span class="n">size</span><span class="p">[],</span> <span class="kt">int</span> <span class="n">banks</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">19</span><span class="cl"><span class="p">{</span>
</span></span><span class="line"><span class="ln">20</span><span class="cl">	<span class="kt">int</span> <span class="n">err</span><span class="p">,</span> <span class="n">nodeoffset</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">21</span><span class="cl">	<span class="kt">int</span> <span class="n">len</span><span class="p">,</span> <span class="n">i</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">22</span><span class="cl">	<span class="n">u8</span> <span class="n">tmp</span><span class="p">[</span><span class="n">MEMORY_BANKS_MAX</span> <span class="o">*</span> <span class="mi">16</span><span class="p">];</span> <span class="cm">/* Up to 64-bit address + 64-bit size */</span>
</span></span><span class="line"><span class="ln">23</span><span class="cl">
</span></span><span class="line"><span class="ln">24</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="n">banks</span> <span class="o">&gt;</span> <span class="n">MEMORY_BANKS_MAX</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="ln">25</span><span class="cl">		<span class="nf">printf</span><span class="p">(</span><span class="s">&#34;%s: num banks %d exceeds hardcoded limit %d.&#34;</span>
</span></span><span class="line"><span class="ln">26</span><span class="cl">		       <span class="s">&#34; Recompile with higher MEMORY_BANKS_MAX?</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span>
</span></span><span class="line"><span class="ln">27</span><span class="cl">		       <span class="n">__FUNCTION__</span><span class="p">,</span> <span class="n">banks</span><span class="p">,</span> <span class="n">MEMORY_BANKS_MAX</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">28</span><span class="cl">		<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">29</span><span class="cl">	<span class="p">}</span>
</span></span><span class="line"><span class="ln">30</span><span class="cl">
</span></span><span class="line"><span class="ln">31</span><span class="cl">	<span class="n">err</span> <span class="o">=</span> <span class="nf">fdt_check_header</span><span class="p">(</span><span class="n">blob</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">32</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="n">err</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="ln">33</span><span class="cl">		<span class="nf">printf</span><span class="p">(</span><span class="s">&#34;%s: %s</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span> <span class="n">__FUNCTION__</span><span class="p">,</span> <span class="nf">fdt_strerror</span><span class="p">(</span><span class="n">err</span><span class="p">));</span>
</span></span><span class="line"><span class="ln">34</span><span class="cl">		<span class="k">return</span> <span class="n">err</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">35</span><span class="cl">	<span class="p">}</span>
</span></span><span class="line"><span class="ln">36</span><span class="cl">
</span></span><span class="line"><span class="ln">37</span><span class="cl">	<span class="cm">/* find or create &#34;/memory&#34; node. */</span>
</span></span><span class="line"><span class="ln">38</span><span class="cl">	<span class="n">nodeoffset</span> <span class="o">=</span> <span class="nf">fdt_find_or_add_subnode</span><span class="p">(</span><span class="n">blob</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="s">&#34;memory&#34;</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">39</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="n">nodeoffset</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">40</span><span class="cl">			<span class="k">return</span> <span class="n">nodeoffset</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">41</span><span class="cl">
</span></span><span class="line"><span class="ln">42</span><span class="cl">	<span class="n">err</span> <span class="o">=</span> <span class="nf">fdt_setprop</span><span class="p">(</span><span class="n">blob</span><span class="p">,</span> <span class="n">nodeoffset</span><span class="p">,</span> <span class="s">&#34;device_type&#34;</span><span class="p">,</span> <span class="s">&#34;memory&#34;</span><span class="p">,</span>
</span></span><span class="line"><span class="ln">43</span><span class="cl">			<span class="k">sizeof</span><span class="p">(</span><span class="s">&#34;memory&#34;</span><span class="p">));</span>
</span></span><span class="line"><span class="ln">44</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="n">err</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="ln">45</span><span class="cl">		<span class="nf">printf</span><span class="p">(</span><span class="s">&#34;WARNING: could not set %s %s.</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span> <span class="s">&#34;device_type&#34;</span><span class="p">,</span>
</span></span><span class="line"><span class="ln">46</span><span class="cl">				<span class="nf">fdt_strerror</span><span class="p">(</span><span class="n">err</span><span class="p">));</span>
</span></span><span class="line"><span class="ln">47</span><span class="cl">		<span class="k">return</span> <span class="n">err</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">48</span><span class="cl">	<span class="p">}</span>
</span></span><span class="line"><span class="ln">49</span><span class="cl">
</span></span><span class="line"><span class="ln">50</span><span class="cl">	<span class="k">for</span> <span class="p">(</span><span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="n">banks</span><span class="p">;</span> <span class="n">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="ln">51</span><span class="cl">		<span class="k">if</span> <span class="p">(</span><span class="n">start</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">==</span> <span class="mi">0</span> <span class="o">&amp;&amp;</span> <span class="n">size</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">52</span><span class="cl">			<span class="k">break</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">53</span><span class="cl">	<span class="p">}</span>
</span></span><span class="line"><span class="ln">54</span><span class="cl">
</span></span><span class="line"><span class="ln">55</span><span class="cl">	<span class="n">banks</span> <span class="o">=</span> <span class="n">i</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">56</span><span class="cl">
</span></span><span class="line"><span class="ln">57</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">banks</span><span class="p">)</span>
</span></span><span class="line"><span class="ln">58</span><span class="cl">		<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">59</span><span class="cl">
</span></span><span class="line"><span class="ln">60</span><span class="cl">	<span class="n">len</span> <span class="o">=</span> <span class="nf">fdt_pack_reg</span><span class="p">(</span><span class="n">blob</span><span class="p">,</span> <span class="n">tmp</span><span class="p">,</span> <span class="n">start</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">banks</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">61</span><span class="cl">
</span></span><span class="line"><span class="ln">62</span><span class="cl">	<span class="n">err</span> <span class="o">=</span> <span class="nf">fdt_setprop</span><span class="p">(</span><span class="n">blob</span><span class="p">,</span> <span class="n">nodeoffset</span><span class="p">,</span> <span class="s">&#34;reg&#34;</span><span class="p">,</span> <span class="n">tmp</span><span class="p">,</span> <span class="n">len</span><span class="p">);</span>
</span></span><span class="line"><span class="ln">63</span><span class="cl">	<span class="k">if</span> <span class="p">(</span><span class="n">err</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="ln">64</span><span class="cl">		<span class="nf">printf</span><span class="p">(</span><span class="s">&#34;WARNING: could not set %s %s.</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span>
</span></span><span class="line"><span class="ln">65</span><span class="cl">				<span class="s">&#34;reg&#34;</span><span class="p">,</span> <span class="nf">fdt_strerror</span><span class="p">(</span><span class="n">err</span><span class="p">));</span>
</span></span><span class="line"><span class="ln">66</span><span class="cl">		<span class="k">return</span> <span class="n">err</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">67</span><span class="cl">	<span class="p">}</span>
</span></span><span class="line"><span class="ln">68</span><span class="cl">	<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
</span></span><span class="line"><span class="ln">69</span><span class="cl"><span class="p">}</span>
</span></span></code></pre></div>
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